Question about 2004 Suzuki RM-Z 250

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I have an 04 RMZ 250 I just re-shimmed the valves and put a new piston in and bike was running great started first kick road it all over the street and golf course. went on ONE ride in the heat and mountains wont kick start at all, and when i was up there i had to bump start it every time I road but still ran strong and normal. Now that i have it home wont kick or bump start. bike has been pulled apart more times than road. please help

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Sounds like maybe valves were shimmed too tight,check service manual for clearances...better a little loose than too tight,can cause alot of damage to cam & head,be careful!!

Posted on Oct 19, 2009

  • james williams
    james williams Oct 19, 2009

    sounds like maybe valves were shimmed too tight,check service manual for clearances...better a little loose than too tight,can cause alot of damage to cam & head,be careful!!

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Put in a new spark plug and check plug wire connections and ECM ground connections.

You probably have weak spark and when bump started the plug sparks strong enough to run the engine.

A weak battey can also cause this. Your ECM needs a minimum of 9V to work. (the ECM gives spark and timing) When kicking over, there is not enough volts to spark. When bumping over the alternator provides the extra volts to start the bike.

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